Armed attackers appear on security camera footage approaching a Turkish aviation company building in Ankara on Wednesday, in this still image from social media video.

ISTANBUL/UNITED NATIONS — The first Ankara attack victims were buried on Thursday, hours after Turkiye struck PKK militants in Iraq after blaming them for the assault on a defense company that killed five people.

As the dust settled after Wednesday's deadly attack on the state-run Turkish Aerospace Industries that also left 22 injured, Turkiye pointed the finger at Kurdish militants as "very likely" responsible.

Turkish investigators had identified one of the attackers as a "PKK terrorist" code-named "Rojger" but were still working to identify his female accomplice, Interior Minister Ali Yerlikaya wrote on X.

Both appeared in CCTV images posted on X in which they are seen emerging from a taxi holding assault rifles and firing their weapons before entering the building.

The taxi driver, who was killed by the attackers, was buried on Thursday at a funeral attended by Parliament Speaker Numan Kurtulmus.

President Recep Tayyip Erdogan, who is in Russia attending the BRICS summit, was to return to Ankara later in the day, his office told AFP.

In a speech to delegates, he thanked those who had shown support, saying, "This cowardly attack has further strengthened Turkiye's determination and resolve to eliminate terrorism."

UN Secretary-General Antonio Guterres strongly condemned the terrorist attack, his spokesman Farhan Haq said on Wednesday.

Guterres expressed his deepest condolences to the victims and their families, and wished a speedy and full recovery to those injured, Haq said, adding the United Nations stands in solidarity with the people and government of the Republic of Turkiye.

Istanbul's two main airports have stepped up security in the wake of the attack, the DHA news agency and private NTV channel reported.

Sabiha Gokcen Airport issued a statement telling passengers to arrive "at least three hours" early to avoid delays because of increased security.

Overnight, the Turkish military struck dozens of Kurdish militant positions in Syria and northern Iraq, hitting "47 terrorist targets, 29 in Iraq and 18 in northern Syria", the Defense Ministry said, indicating the raids would continue.

Kurdish sources in northern Syria said the strikes had killed 12 civilians and wounded 25 others.